waterFYI.com

Hard water is not considered harmful to your health, but it can cause ugly stains from scale build up in sinks, tubs, and elsewhere if left unchecked.  People notice the stains, but they are generally unaware of the significant hidden costs of the scale build until it is too late. 

Scale is formed when minerals (usually calcium) are precipitated out of water.  The scaling process accelerates dramatically when the temperature of the water increases or when water travels across the electrically charged plates in a water ionizer.

The hidden costs